Just for this weekend, Echo Bay Books’ publication “The Quick and Easy Guide to Raspberry Pi” is free for Kindle from Amazon.
UK people click here to get it from the Kindle store on Amazon.co.uk.
International people click here to get it from the Kindle store on Amazon.com.
I’ve not read it yet but from the first few pages on Look Inside, it looks to be a fairly standard text with obvious diagrams, but probably no worse for that. Interestingly, the contents page says that it covers the Pi Store, which means it’s bang up-to-date (for now).